CN111818525B - Secret key updating method and system facing space information network - Google Patents
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Abstract
The invention provides a secret key updating method and a secret key updating system facing to a space information network, which are applied to a communication satellite and comprise the following steps: generating a target session key based on the seed key before updating; acquiring a target encryption parameter; the target encryption parameter is obtained after the ground control center corresponding to the communication satellite encrypts the seed key synchronization parameter by using a target session key; decrypting the target encryption parameter by using the target session key to obtain a seed key synchronization parameter; determining an updated seed key in a preset seed key matrix based on the seed key synchronization parameter; the preset seed key matrix is a matrix formed by taking the preset seed keys as matrix elements, wherein one matrix element corresponds to one preset seed key. The invention solves the technical problem of complex key distribution mode in the prior art.
Description
Technical Field
The invention relates to the technical field of network security, in particular to a secret key updating method and a secret key updating system for a spatial information network.
Background
Satellite communication is a communication means that can provide users with ubiquitous access. No matter you are in city, sea or desert, the communication can be carried out as long as you are within the coverage of the electric wave emitted by the satellite, and the communication is not limited by the geographical position. Satellite communications will have irreplaceable status in the future, whether civilian or military. As satellite communication plays an increasing role in the field of communications, new requirements are also placed on the security of satellite communication.
At present, a data encryption system of a ground communication network is generally adopted for satellite communication security, namely a symmetric encryption system is used for encrypting data, and the security of the symmetric encryption system mainly depends on the security of a secret key. In key distribution, a distribution method of symmetric keys encrypted by asymmetric cryptography is commonly used. However, the asymmetric encryption system involves large number of operations in the encryption and decryption processes, the algorithm complexity is high, the encryption and decryption speed is very slow, the distribution process of the asymmetric cryptographic symmetric key is complex, and the asymmetric cryptographic symmetric key is not suitable for a space communication network with limited computing resources and high communication delay.
Disclosure of Invention
In view of this, the present invention provides a method and a system for updating a key for a spatial information network, so as to alleviate the technical problem in the prior art that the key distribution method is complicated.
In a first aspect, an embodiment of the present invention provides a secret key updating method for a spatial information network, which is applied to a communication satellite, and includes: generating a target session key based on the seed key before updating; acquiring a target encryption parameter; the target encryption parameter is an encryption parameter obtained after a ground control center corresponding to the communication satellite encrypts the seed key synchronization parameter by using the target session key; decrypting the target encryption parameter by using the target session key to obtain the seed key synchronization parameter; determining an updated seed key in a preset seed key matrix based on the seed key synchronization parameter; the preset seed key matrix is a matrix formed by taking preset seed keys as matrix elements, wherein one matrix element corresponds to one preset seed key.
Further, generating a target session key based on the seed key before updating, comprising: initializing the ancestor hedge algorithm set based on the seed key before updating to obtain the initialized ancestor hedge algorithm set; and generating a target session key by utilizing the algorithm set of the grandfather after the initialization.
Further, determining the updated seed key in a preset seed key matrix based on the seed key synchronization parameter includes: generating a seed key pointer based on the seed key synchronization parameter; determining a target matrix element in the preset seed key matrix based on the seed key pointer; and determining the preset seed key corresponding to the target matrix element as the updated seed key.
Further, the method further comprises: generating an initial session key, comprising: acquiring an initial seed key synchronization parameter; generating an initial seed key pointer based on the initial seed key synchronization parameter; determining an initial matrix element in the preset seed key matrix based on the initial seed key pointer; determining a preset seed key corresponding to the initial matrix element as an initial seed key; an initial session key is generated based on the initial seed key and the set of ancestry algorithms.
Further, the method further comprises: and updating the preset seed key matrix.
Further, updating the preset seed key matrix includes: acquiring a target encryption matrix element; the target encryption matrix element is an encryption matrix element obtained by encrypting a new preset seed key by using a preset seed key corresponding to a matrix element to be updated in a preset seed key matrix and the target session key; decrypting the target encryption matrix element based on a preset seed key corresponding to the matrix element to be updated and the target session key to obtain a new preset seed key; and updating the preset seed key matrix by taking the new preset seed key as the matrix element to be updated.
In a second aspect, an embodiment of the present invention further provides a key updating system for a spatial information network, which is applied to a communication satellite, and includes: the device comprises a generating module, an obtaining module, a decrypting module and an updating module, wherein the generating module is used for generating a target session key based on a seed key before updating; the acquisition module is used for acquiring target encryption parameters; the target encryption parameter is an encryption parameter obtained after a ground control center corresponding to the communication satellite encrypts the seed key synchronization parameter by using the target session key; the decryption module is used for decrypting the target encryption parameter by using the target session key to obtain the seed key synchronization parameter; the updating module is used for determining the updated seed key in a preset seed key matrix based on the seed key synchronization parameter; the preset seed key matrix is a matrix formed by taking preset seed keys as matrix elements, wherein one matrix element corresponds to one preset seed key.
Further, the system further comprises: and the key matrix updating module is used for updating the preset seed key matrix.
In a third aspect, an embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, where the processor implements the steps of the method according to the first aspect when executing the computer program.
In a fourth aspect, the present invention further provides a computer-readable medium having non-volatile program code executable by a processor, where the program code causes the processor to execute the method according to the first aspect.
The invention provides a secret key updating method and a secret key updating system facing a spatial information network, wherein a target session secret key is generated based on a seed secret key before updating; acquiring a target encryption parameter; then, decrypting the target encryption parameter by using the target session key to obtain a seed key synchronization parameter; and finally, determining the updated seed key in the preset seed key matrix based on the seed key synchronization parameter, wherein the seed key synchronization parameter is distributed after being encrypted, and then the key distribution process in the satellite communication process is realized by combining the seed key synchronization parameter with the preset seed key matrix, so that the key distribution safety is ensured and the technical problem of complex key distribution mode in the prior art is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a key updating method for a spatial information network according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for surviving an initial session key according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a satellite communication network according to an embodiment of the present invention;
fig. 4 is a flowchart of a session key generation method according to an embodiment of the present invention;
FIG. 5 is a flowchart of a seed key updating method according to an embodiment of the present invention;
fig. 6 is a flowchart of a seed key matrix updating method according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a spatial information network-oriented key update system according to an embodiment of the present invention;
fig. 8 is a schematic diagram of another spatial information network-oriented key update system according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
fig. 1 is a flowchart of a spatial information network-oriented key updating method applied to a communication satellite in a satellite communication network according to an embodiment of the present invention. Wherein the satellite communication network further comprises a ground control center corresponding to the communication satellite. As shown in fig. 1, the method specifically includes the following steps:
step S102, generating a target session key based on the seed key before updating.
In the embodiment of the invention, the seed key is used for initializing grand algorithm set (ZUC algorithm), and the seed key before updating is respectively stored on a communication satellite of a satellite communication network and a ground control center. Both the communications satellite and the ground control center may generate the target session key by updating the previous seed key. The target session key is used to encrypt communications procedures of the satellite communications network.
Specifically, initializing an algorithm set of ancestor hedge based on a seed key before updating to obtain an initialized algorithm set of ancestor hedge; and generating a target session key by using the algorithm set of the grandfather after initialization.
Step S104, acquiring a target encryption parameter; the target encryption parameter is obtained after the ground control center corresponding to the communication satellite encrypts the seed key synchronization parameter by using the target session key. The seed key synchronization parameter is a parameter for updating the seed key.
And step S106, decrypting the target encryption parameter by using the target session key to obtain the seed key synchronization parameter.
Step S108, determining an updated seed key in a preset seed key matrix based on the seed key synchronization parameter; the preset seed key matrix is a matrix formed by taking the preset seed keys as matrix elements, wherein one matrix element corresponds to one preset seed key.
Alternatively, the communication satellite may discard or revoke the seed key synchronization parameter after updating the seed key with the seed key synchronization parameter.
According to the key updating method for the spatial information network, provided by the embodiment of the invention, the seed key synchronization parameter is distributed after being encrypted, and then the key distribution process in the satellite communication process is realized by combining the seed key synchronization parameter with the preset seed key matrix, so that the key distribution safety is ensured, and the technical problem of complex key distribution mode in the prior art is solved.
In this embodiment of the present invention, before updating the seed key, the method further includes: an initial session key is generated. Fig. 2 is a flowchart of a method for surviving an initial session key according to an embodiment of the present invention, and it should be noted that the method may be applied to a communication satellite in a satellite communication network, and may also be applied to a ground control center in the satellite communication network. Specifically, as shown in fig. 2, the method includes the steps of:
step S201, acquiring an initial seed key synchronization parameter; the initial seed key synchronization parameter is a parameter which is pre-loaded into a ground control center and a communication satellite;
step S202, generating an initial seed key pointer based on the initial seed key synchronization parameter;
step S203, determining an initial matrix element in a preset seed key matrix based on the initial seed key pointer;
step S204, determining a preset seed key corresponding to the initial matrix element as an initial seed key;
step S205, generating an initial session key based on the initial seed key and the ancestry algorithm set; specifically, the initial session key is generated by using the initial seed key as an initialization parameter of the ancestry algorithm set.
Optionally, step S108 further includes the steps of:
step S1081, generating a seed key pointer based on the seed key synchronization parameter;
step S1082, determining a target matrix element in a preset seed key matrix based on the seed key pointer;
step S1083, determining a preset seed key corresponding to the target matrix element as the updated seed key.
In the embodiment of the invention, after the target session key is generated, when the ground control center updates the seed key each time, the target session key is used for encrypting the new seed key synchronization parameter, and then the encrypted seed key synchronization parameter is sent to the communication satellite; after receiving the cipher text, the communication satellite can directly decrypt the cipher text by using the target session key to obtain the new seed key synchronization parameter.
Optionally, the method provided in the embodiment of the present invention further includes: and updating the preset seed key matrix. Specifically, the method comprises the following steps:
step S301, acquiring a target encryption matrix element; the target encryption matrix element is a ground control center, and the encryption matrix element is obtained after the new preset seed key is encrypted by using a preset seed key and a target session key corresponding to the matrix element to be updated in the preset seed key matrix;
step S302, based on the preset seed key and the target session key corresponding to the matrix element to be updated, decrypting the target encryption matrix element to obtain a new preset seed key;
step S303, the new preset seed key is used as a matrix element to be updated, and the preset seed key matrix is updated.
When the seed key matrix is updated in the embodiment of the invention, a new seed key matrix is generated by the ground control center. Encrypting a corresponding new preset seed key in the new seed key matrix by using the corresponding old seed key in the old seed key matrix and the target session key to obtain a ciphertext, and then sending the ciphertext to a communication satellite; the communication satellite can update the elements in the seed key matrix by decrypting the ciphertext, and the seed key matrix is updated after all the elements are updated.
The embodiment of the invention provides a secret key updating method and a secret key updating system facing a space information network, which can be used for carrying out double encryption by using a current seed secret key matrix parameter and a session secret key when updating the secret key on the basis of using a symmetric encryption system in a satellite communication network without depending on a traditional asymmetric encryption system, thereby greatly increasing the safety of updating and distributing the session secret key and simultaneously relieving the technical problem of complex secret key distribution mode in the prior art.
Example two:
the embodiment of the present invention specifically describes and explains a spatial information network-oriented key updating method in the first embodiment of the present invention with reference to a specific satellite communication network example. The specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention.
Fig. 3 is a schematic diagram of a satellite communication network according to an embodiment of the present invention. As shown in fig. 3, the Satellite communication Network includes a control center (NOCC), a gateway station (GW), and a Satellite (Satellite Network), and key distribution and update procedures are applied between the control center and the Satellite.
The embodiment of the invention provides a secret key updating method facing to a spatial information network, which comprises the following steps: session key generation, seed key updating and seed key matrix updating. The symmetric encryption algorithm is exemplified by the ZUC encryption algorithm.
Fig. 4 is a flowchart of a session key generation method according to an embodiment of the present invention, as shown in fig. 4, specifically including the following steps:
step S401, generating seed key pointer { x }i,yi}。
The control center and the satellite are pre-loaded with the same seed key matrix and initial seed key synchronization parameter, namely initial seed key synchronization parameter IKEYiniWith a length of 256 bits, it is first divided into the first 128 bits IKSP1And a rear 128 bit IKSP2；
Using IKSP1Generating the abscissa x of the pointeriTo IKSP1Divided into 32 blocks IKSP of 4bit length1[0]、IKSP1[1]、……、IKSP1[31]. Then the 32 blocks are all XOR-ed to obtain a 4-bit long result value and converted into 10-system, and then the x-axis of the abscissa can be obtainedi。
In the same way, the ordinate y of the pointer can be generatedi. To this end, a seed key pointer { x ] indicating the key used for current session encryption is obtainedi,yi}。
Step S402, a seed key is selected.
According to the generated seed key pointer { xi,yiAt a 16 × 16 seed key Matrix xi,yi]Select the corresponding seed key IKiAnd outputs the result, which can be used as the seed key for ZUC sequence cipher encryption. Wherein,
is the seed key.
Step S403, generating a session key Ks。
The seed key IK with the length of 256 bits is used as an initialization parameter of a ZUC sequence encryption algorithm and input to obtain a session key Ks。
Fig. 5 is a flowchart of a seed key updating method according to an embodiment of the present invention, as shown in fig. 5, specifically including:
control center selects new seed key IKiAnd apply IKiThe position in the seed key matrix is indicated by a decimal seed key pointer xi,yi}, seed key synchronization parameter IKEY converted to binaryi(ii) a Using a session key KsDirect encryption seed key synchronization parameter IKEYiObtaining a ciphertext C; sending the ciphertext C to the satellite through the gateway station;
satellite utilization session key KsDecrypting the ciphertext C to obtain a seed key synchronization parameter IKEYiUsing IKEYiGenerating seed Key pointer { xi,yiIs in the seed key Matrix xi,yi]To select a new seed key IKi。
Seed key synchronization parameter IKEYiThe encryption process is described as follows:
fig. 6 is a flowchart of a seed key matrix updating method according to an embodiment of the present invention, as shown in fig. 6, specifically including:
the control center generates a new seed key Matrix IKi]And the seed key IK in the data is usediSequentially encrypted and then sent to a satellite, and the satellite decrypts to obtain a new seed key IKiUpdating the elements in the seed key matrix in sequence; and repeating the process until the satellite seed key matrix is updated.
In particular, the control center utilizes seed keys in an old seed key matrix
Seed key IK at corresponding position in encrypted new seed key matrixi(ii) a Reusing session key KsPerforming the second encryption to obtain the seed key IKiCipher text C ofi(ii) a Seed key IKiThe encryption process is described as follows:
cipher text CiTransmitted to the satellite using the session key KsAnd the corresponding old seed key in the seed key matrix
The new seed key IK can be obtained by decryptioni(ii) a Satellite sends its IKiAs new seed key to replace the corresponding old seed key in the seed key matrix
The encryption algorithm used in the above-described embodiment of the present invention is a published encryption standard, and is not within the scope of the present invention.
Example three:
fig. 7 is a schematic diagram of a spatial information network-oriented key update system applied to a communication satellite according to an embodiment of the present invention. As shown in fig. 7, the system includes: a generating module 10, an obtaining module 20, a decrypting module 30 and an updating module 40.
Specifically, the generating module 10 is configured to generate the target session key based on the seed key before updating.
An obtaining module 20, configured to obtain a target encryption parameter; the target encryption parameter is obtained after the ground control center corresponding to the communication satellite encrypts the seed key synchronization parameter by using the target session key.
And the decryption module 30 is configured to decrypt the target encryption parameter with the target session key to obtain the seed key synchronization parameter.
An updating module 40, configured to determine an updated seed key in a preset seed key matrix based on the seed key synchronization parameter; the preset seed key matrix is a matrix formed by taking the preset seed keys as matrix elements, wherein one matrix element corresponds to one preset seed key.
According to the key updating system facing the spatial information network, the seed key synchronization parameters are encrypted and then distributed, and then the seed key synchronization parameters are combined with the preset seed key matrix, so that the key distribution process in the satellite communication process is realized, the key distribution safety is ensured, and the technical problem of complex key distribution mode in the prior art is solved.
Optionally, fig. 8 is a schematic diagram of another spatial information network-oriented key update system provided according to an embodiment of the present invention, and as shown in fig. 8, the system further includes: and a key matrix updating module 50, configured to update the preset seed key matrix.
In particular, the key matrix updating module 50 is further configured to:
acquiring a target encryption matrix element; the target encryption matrix element is a ground control center, and the encryption matrix element is obtained after the new preset seed key is encrypted by using a preset seed key and a target session key corresponding to the matrix element to be updated in the preset seed key matrix; decrypting the target encryption matrix element based on a preset seed key and a target session key corresponding to the matrix element to be updated to obtain a new preset seed key; and updating the preset seed key matrix by taking the new preset seed key as a matrix element to be updated.
The embodiment of the present invention further provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and when the processor executes the computer program, the steps of the method in the first embodiment are implemented.
The embodiment of the invention also provides a computer readable medium with a non-volatile program code executable by a processor, wherein the program code causes the processor to execute the method in the first embodiment.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. A secret key updating method facing to a spatial information network is applied to a communication satellite, and is characterized by comprising the following steps:
generating a target session key based on the seed key before updating;
acquiring a target encryption parameter; the target encryption parameter is an encryption parameter obtained after a ground control center corresponding to the communication satellite encrypts the seed key synchronization parameter by using the target session key;
decrypting the target encryption parameter by using the target session key to obtain the seed key synchronization parameter;
determining an updated seed key in a preset seed key matrix based on the seed key synchronization parameter; the preset seed key matrix is a matrix formed by taking preset seed keys as matrix elements, wherein one matrix element corresponds to one preset seed key;
determining the updated seed key in a preset seed key matrix based on the seed key synchronization parameter, including:
generating a seed key pointer based on the seed key synchronization parameter;
determining a target matrix element in the preset seed key matrix based on the seed key pointer;
and determining the preset seed key corresponding to the target matrix element as the updated seed key.
2. The method of claim 1, wherein generating a target session key based on the seed key before updating comprises:
initializing the ancestor hedge algorithm set based on the seed key before updating to obtain the initialized ancestor hedge algorithm set;
and generating a target session key by utilizing the algorithm set of the grandfather after the initialization.
3. The method of claim 1, further comprising: generating an initial session key, comprising:
acquiring an initial seed key synchronization parameter;
generating an initial seed key pointer based on the initial seed key synchronization parameter;
determining an initial matrix element in the preset seed key matrix based on the initial seed key pointer;
determining a preset seed key corresponding to the initial matrix element as an initial seed key;
an initial session key is generated based on the initial seed key and the set of ancestry algorithms.
4. The method of claim 1, further comprising: and updating the preset seed key matrix.
5. The method of claim 4, wherein updating the pre-defined seed key matrix comprises:
acquiring a target encryption matrix element; the target encryption matrix element is an encryption matrix element obtained by encrypting a new preset seed key by using a preset seed key corresponding to a matrix element to be updated in a preset seed key matrix and the target session key;
decrypting the target encryption matrix element based on a preset seed key corresponding to the matrix element to be updated and the target session key to obtain a new preset seed key;
and updating the preset seed key matrix by taking the new preset seed key as the matrix element to be updated.
6. A spatial information network-oriented key updating system applied to a communication satellite is characterized by comprising: a generating module, an obtaining module, a decrypting module and an updating module, wherein,
the generation module is used for generating a target session key based on the seed key before updating;
the acquisition module is used for acquiring target encryption parameters; the target encryption parameter is an encryption parameter obtained after a ground control center corresponding to the communication satellite encrypts the seed key synchronization parameter by using the target session key;
the decryption module is used for decrypting the target encryption parameter by using the target session key to obtain the seed key synchronization parameter;
the updating module is used for determining the updated seed key in a preset seed key matrix based on the seed key synchronization parameter; the preset seed key matrix is a matrix formed by taking preset seed keys as matrix elements, wherein one matrix element corresponds to one preset seed key.
7. The system of claim 6, further comprising: and the key matrix updating module is used for updating the preset seed key matrix.
8. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any of the preceding claims 1 to 5 are implemented when the computer program is executed by the processor.
9. A computer-readable medium having non-volatile program code executable by a processor, wherein the program code causes the processor to perform the method of any of claims 1-5.
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